- Title
- Electrophysiological correlates of anticipatory and poststimulus components of task switching
- Creator
- Karayanidis, Frini; Coltheart, Max; Michie, Patricia T.; Murphy, Karen
- Relation
- Psychophysiology Vol. 40, Issue 3, p. 329-348
- Publisher Link
- http://dx.doi.org/10.1111/1469-8986.00037
- Publisher
- Blackwell Publishing, Inc.
- Resource Type
- journal article
- Date
- 2003
- Description
- Task-switching paradigms can shed light on cognitive and neural processes underlying attentional control mechanisms. An alternating runs task-switching paradigm (R. D. Rogers & S. Monsell, 1995) is used to identify ERP components associated with anticipatory and poststimulus components of task-switching processes. Subjects alternated between two tasks in a predictable series (AABB). Reaction time (RT) switch cost reduced with increasing response-stimulus (R-S) interval and a residual switch cost remained at the longest R-S interval. A switch-related positivity (D-Pos) developed in the R-S interval. D-Pos was time-locked to response onset, peaked around 400 ms post-response onset, and was unaffected by task-set interference. A switch-related negativity (D-Neg) emerged after stimulus onset. D-Neg peaked earlier with increasing R-S interval and its amplitude and latency were affected by task-set interference. D-Pos and D-Neg were interpreted within current models of task-switching.
- Subject
- task-switching processes; predictable series
- Identifier
- uon:1605
- Identifier
- http://hdl.handle.net/1959.13/27367
- Identifier
- ISSN:0048-5772
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